基于LES的亚临界和超临界圆球绕流数值研究
发布时间：2018-11-20 07:12
【摘要】：三维圆球绕流是流体力学中的经典问题,国内外学者曾对此进行过许多研究,但大多局限于较低雷诺数。该文采用基于动力亚格子模型的大涡模拟对亚临界雷诺数(Re=10~4)和超临界雷诺数(Re=1.14×10~6)等高雷诺数下的圆球绕流进行了数值仿真计算。计算结果表明,得到的阻力时均值和经典Re-Cd曲线相吻合,相比于亚临界雷诺数,超临界雷诺数下近球面回流区剧烈收缩,阻力系数锐减;圆球尾流场明显偏离了中心轴(x轴),导致了侧向力的存在;球后有大尺度的规则涡从圆球表面脱落。
[Abstract]:Three-dimensional spherical flow is a classical problem in hydrodynamics, which has been studied by many scholars at home and abroad, but mostly confined to lower Reynolds number. In this paper, the large eddy simulation based on dynamic sublattice model is used to simulate the flow around a sphere at high Reynolds numbers such as subcritical Reynolds number (Re=10~4) and supercritical Reynolds number (Re=1.14 脳 10 ~ 6). The calculated results show that the mean value of resistance time is consistent with the classical Re-Cd curve. Compared with the subcritical Reynolds number, the circumfluence region near the spherical surface shrinks sharply under the supercritical Reynolds number, and the drag coefficient decreases sharply. The wake field of the sphere deviates from the central axis (x axis), resulting in the existence of lateral force, and a large scale regular vortex shedding from the surface of the ball.
【作者单位】： 华中科技大学船舶与海洋工程学院;
【基金】：国家高技术研究发展计划(863计划,2012AA091002)~~
【分类号】：O357.5
[Abstract]:Three-dimensional spherical flow is a classical problem in hydrodynamics, which has been studied by many scholars at home and abroad, but mostly confined to lower Reynolds number. In this paper, the large eddy simulation based on dynamic sublattice model is used to simulate the flow around a sphere at high Reynolds numbers such as subcritical Reynolds number (Re=10~4) and supercritical Reynolds number (Re=1.14 脳 10 ~ 6). The calculated results show that the mean value of resistance time is consistent with the classical Re-Cd curve. Compared with the subcritical Reynolds number, the circumfluence region near the spherical surface shrinks sharply under the supercritical Reynolds number, and the drag coefficient decreases sharply. The wake field of the sphere deviates from the central axis (x axis), resulting in the existence of lateral force, and a large scale regular vortex shedding from the surface of the ball.
【作者单位】： 华中科技大学船舶与海洋工程学院;
【基金】：国家高技术研究发展计划(863计划,2012AA091002)~~
【分类号】：O357.5
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